/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.expr.holders;
/**
* Wrapper object for an individual value in Drill.
*
* ValueHolders are designed to be mutable wrapper objects for defining clean
* APIs that access data in Drill. For performance, object creation is avoided
* at all costs throughout execution. For this reason, ValueHolders are
* disallowed from implementing any methods, this allows for them to be
* replaced by their java primitive inner members during optimization of
* run-time generated code.
*/
public interface ValueHolder {
}